<?php
	

	// $array = array();
	// echo $array;
	// $array = {1,2};

	echo "</br>";
	$array["a"] = "d";
	echo $array."</br>";
	echo $array["a"]."</br>";
	echo $array[0]."</br>";
	
	$array = array("a" => "b",1 => 2,0 => 5 );
	echo $array;
	
	
	echo "</br>";
	echo $a;
	$a = null;
	echo "</br>";
	echo $a;
	$a = 10;
	echo "</br>";
	echo $a;
	unset($a);
	echo "<br>".$a;
	echo (boolean)($a == null);
	echo "</br>";
	echo is_null($a);
	echo "</br>";
	$a = array();
	$array[0] = (array)$a;
	echo $array[0];
?>